a s m em C 
à = N° C'(CHT IC)" euo - x] | (28) 
A is the influence of the .constraint on. the solution. From 
(17) ‘or (18), one can see the Sequential nature of the 
adjustment. 
If this approach is to be. useful, then equation (20). must.be 
evaluated to see if the -computational burden negates any 
economic savings that Jed to the selection of  aeríal 
photography in the-first place. Let 
Hu Mi2 M, 3 : 
N-1 = £21) 
N M 2 VM 
Ma 3 
The design matrix for the functional constraint (C) can be 
shown to be 
  
  
es À 
CR MCL CT (22) 
where the superscript ec, and. | relate ‘to exterior 
orientation, survey, and interior orientation parameters 
respectively. Since the parameters only involve-the survey 
points 
e i 
C 20509 
Therefore, 
RT 
Mi2C' 
— S 
N7lC' = |M22C' 
S 
i 
and 
(EN 71C’) "1 = (CM22C')'1 (23) 
where M, is block diagonal composed of 3x3 submatrices. 
Thus,. one. can. see that . only à 1 Smald portion! of: the normal 
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